groundmass - definizione. Che cos'è groundmass
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Cosa (chi) è groundmass - definizione

GEOLOGICAL TERM FOR THE MASS OF MATERIAL IN WHICH LARGER GRAINS, CRYSTALS OR CLASTS ARE EMBEDDED
Groundmass; Rock matrix; Cementing material
  • porphyry]]

groundmass         
¦ noun Geology the compact, finer-grained material in which the crystals are embedded in a porphyritic rock.
Matrix (geology)         
The matrix or groundmass of a rock is the finer-grained mass of material in which larger grains, crystals, or clasts are embedded.

Wikipedia

Matrix (geology)

The matrix or groundmass of a rock is the finer-grained mass of material in which larger grains, crystals, or clasts are embedded.

The matrix of an igneous rock consists of finer-grained, often microscopic, crystals in which larger crystals, called phenocrysts, are embedded. This porphyritic texture is indicative of multi-stage cooling of magma. For example, porphyritic andesite will have large phenocrysts of plagioclase in a fine-grained matrix. Also in South Africa, diamonds are often mined from a matrix of weathered clay-like rock (kimberlite) called "yellow ground".

The matrix of sedimentary rocks is finer-grained sedimentary material, such as clay or silt, in which larger grains or clasts are embedded. It is also used to describe the rock material in which a fossil is embedded.